/*
 * FreeRTOS+FAT V2.3.3
 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * https://www.FreeRTOS.org
 * https://github.com/FreeRTOS
 *
 */

/**
 *	@file		ff_memory.h
 *	@ingroup	MEMORY
 **/

#ifndef _FF_MEMORY_H_
#define _FF_MEMORY_H_

/*
 * When sector data is written or analysed, some values might be stored unaligned.
 * The routines below treat all values as little arrays of either 2 or 4 bytes.
 * Also on big endian platforms, the order of bytes will be swapped.
 */
/*---------- PROTOTYPES */

#if ( ffconfigBYTE_ORDER == pdFREERTOS_LITTLE_ENDIAN )

/*
 * FAT is little endian.
 * On a little endian CPU, bytes will be copied to the structures below 1-to-1 :
 */
    typedef struct
    {
        uint8_t u8_0; /* the first byte */
        uint8_t u8_1; /* the second byte */
    } FF_TShort_t;

    typedef struct
    {
        uint8_t u8_0;
        uint8_t u8_1;
        uint8_t u8_2;
        uint8_t u8_3;
    } FF_TLong_t;
#elif ( ffconfigBYTE_ORDER == pdFREERTOS_BIG_ENDIAN )

/*
 * On a big endian CPU, all bytes will be swapped, either 2 or 4 bytes:
 */
    typedef struct
    {
        uint8_t u8_1; /* the second byte */
        uint8_t u8_0; /* the first byte */
    } FF_TShort_t;

    typedef struct
    {
        uint8_t u8_3;
        uint8_t u8_2;
        uint8_t u8_1;
        uint8_t u8_0;
    } FF_TLong_t;
#else /* if ( ffconfigBYTE_ORDER == pdFREERTOS_LITTLE_ENDIAN ) */
    #error Little or Big Endian? - Please set ffconfigBYTE_ORDER to either pdFREERTOS_LITTLE_ENDIAN or pdFREERTOS_BIG_ENDIAN 1 in FreeRTOSFATConfig.h
#endif /* if ( ffconfigBYTE_ORDER == pdFREERTOS_LITTLE_ENDIAN ) */

/*! 16-bit union. */
typedef union
{
    uint16_t u16;
    FF_TShort_t bytes;
} FF_T_UN16;

/*! 32-bit union. */
typedef union
{
    uint32_t u32;
    FF_TLong_t bytes;
} FF_T_UN32;

/*	HT inlined these functions:
 */

#if ( ffconfigINLINE_MEMORY_ACCESS != 0 )

    static portINLINE uint8_t FF_getChar( const uint8_t * pBuffer,
                                          uint32_t aOffset )
    {
        return ( uint8_t ) ( pBuffer[ aOffset ] );
    }

    static portINLINE uint16_t FF_getShort( const uint8_t * pBuffer,
                                            uint32_t aOffset )
    {
        FF_T_UN16 u16;

        pBuffer += aOffset;
        u16.bytes.u8_1 = pBuffer[ 1 ];
        u16.bytes.u8_0 = pBuffer[ 0 ];

        return u16.u16;
    }

    static portINLINE uint32_t FF_getLong( const uint8_t * pBuffer,
                                           uint32_t aOffset )
    {
        FF_T_UN32 u32;

        pBuffer += aOffset;
        u32.bytes.u8_3 = pBuffer[ 3 ];
        u32.bytes.u8_2 = pBuffer[ 2 ];
        u32.bytes.u8_1 = pBuffer[ 1 ];
        u32.bytes.u8_0 = pBuffer[ 0 ];

        return u32.u32;
    }

    static portINLINE void FF_putChar( uint8_t * pBuffer,
                                       uint32_t aOffset,
                                       uint32_t Value )
    {
        pBuffer[ aOffset ] = ( uint8_t ) Value;
    }

    static portINLINE void FF_putShort( uint8_t * pBuffer,
                                        uint32_t aOffset,
                                        uint32_t Value )
    {
        FF_T_UN16 u16;

        u16.u16 = ( uint16_t ) Value;
        pBuffer += aOffset;
        pBuffer[ 0 ] = u16.bytes.u8_0;
        pBuffer[ 1 ] = u16.bytes.u8_1;
    }

    static portINLINE void FF_putLong( uint8_t * pBuffer,
                                       uint32_t aOffset,
                                       uint32_t Value )
    {
        FF_T_UN32 u32;

        u32.u32 = Value;
        pBuffer += aOffset;
        pBuffer[ 0 ] = u32.bytes.u8_0;
        pBuffer[ 1 ] = u32.bytes.u8_1;
        pBuffer[ 2 ] = u32.bytes.u8_2;
        pBuffer[ 3 ] = u32.bytes.u8_3;
    }

#else /* ffconfigINLINE_MEMORY_ACCESS */

    uint8_t FF_getChar( const uint8_t * pBuffer,
                        uint32_t aOffset );
    uint16_t FF_getShort( const uint8_t * pBuffer,
                          uint32_t aOffset );
    uint32_t FF_getLong( const uint8_t * pBuffer,
                         uint32_t aOffset );
    void FF_putChar( uint8_t * pBuffer,
                     uint32_t aOffset,
                     uint32_t Value );
    void FF_putShort( uint8_t * pBuffer,
                      uint32_t aOffset,
                      uint32_t Value );
    void FF_putLong( uint8_t * pBuffer,
                     uint32_t aOffset,
                     uint32_t Value );

#endif /* ffconfigINLINE_MEMORY_ACCESS */

#endif /* _FF_MEMORY_H_ */
